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Java

Posted by Doron Zehavi
Doron Zehavi
Courses Plus Student 1,616 Points

Items not loading in ThymeLeaf for-each block using Hibernate

I am following along on the Hibernate with Spring course and I am writing a parallel project to the one in the course. I have duplicated the code identically to the course code and have the database working and accepting SQL statements in the browser.

My Spring application is also running and I am able to get to the correct page with the correct template.

However, my data is not loading in the container div. I have no idea how to further debug this as it is a web application. I have run out of ideas for what might have gone wrong. What should I do to determine and fix the problem?

The code for this portion of the template follows, and is using the name of the model for my parallel project.

<div class="news container">
<div class="row">
    Newsitems -----
    <div th:each="newsitem : ${newsfeed}" class="col s12 l4">
        <div class="card">
            <div class="card-content">
                <div class="card-title">

                    <a href="http://google.com/" class="name"  th:text="${newsitem.title}">Item Title</a>
                </div>
            </div>
        </div>
    </div>
</div>
</div>

Here is the code for the controller:

@Controller
public class FeedController {

    @Autowired
    private SessionFactory sessionFactory;

    @SuppressWarnings("unchecked")
    @RequestMapping(value = "/feed")
    public String listNewsItems(Model model) {
        Session session = sessionFactory.openSession();
        List<NewsItem> newsFeedList = fetchAllNewsItems();
        model.addAttribute("newsfeed", newsFeedList);
        return "feed";
    }

    private List<NewsItem> fetchAllNewsItems() {

        Session session = sessionFactory.openSession();

        CriteriaBuilder builder = session.getCriteriaBuilder();
        CriteriaQuery<NewsItem> criteria = builder.createQuery(NewsItem.class);
        criteria.from(NewsItem.class);

        List<NewsItem> newsItemList = session.createQuery(criteria).getResultList();

        session.close();

        return newsItemList;
    }
}
Doron Zehavi
Doron Zehavi
Courses Plus Student 1,616 Points

I was able to figure out how to debug the app in Intellij! (right click main method and click Debug Application.main())

It looks like my "FetchAllNewsItems" isn't returning a list.

Doron Zehavi
Doron Zehavi
Courses Plus Student 1,616 Points

It also looks like my database is not persisting rows that were added. I noticed it persisted it initially when I inserted the new row. But when I query now, it says there are no rows. Why is it not persisting?

This was the answer by the way. The database had no items in it. However, I previously added an item. When I found out the item was no longer persisted, I inserted it again and ran my application and the item appeared!

It looks like when I restart my spring server, it drops the table!